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El-Mansi S, Mitchell TP, Mobayen G, McKinnon TAJ, Miklavc P, Frick M, Nightingale TD. Myosin-1C augments endothelial secretion of von Willebrand factor by linking contractile actomyosin machinery to the plasma membrane. Blood Adv 2024; 8:4714-4726. [PMID: 38669344 DOI: 10.1182/bloodadvances.2024012590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 04/15/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024] Open
Abstract
ABSTRACT Blood endothelial cells control the hemostatic and inflammatory response by secreting von Willebrand factor (VWF) and P-selectin from storage organelles called Weibel-Palade bodies (WPBs). Actin-associated motor proteins regulate this secretory pathway at multiple points. Before fusion, myosin Va forms a complex that anchors WPBs to peripheral actin structures, allowing for the maturation of content. After fusion, an actomyosin ring/coat is recruited and compresses the WPB to forcibly expel the largest VWF multimers. Here, we provide, to our knowledge, the first evidence for the involvement of class I myosins during regulated VWF secretion. We show that the unconventional myosin-1C (Myo1c) is recruited after fusion via its pleckstrin homology domain in an actin-independent process. This provides a link between the actin ring and phosphatidylinositol 4,5-bisphosphate (PIP2) at the membrane of the fused organelle and is necessary to ensure maximal VWF secretion. This is an active process requiring Myo1c ATPase activity because inhibition of class I myosins using the inhibitor pentachloropseudilin or expression of an ATPase-deficient Myo1c rigor mutant perturbs the expulsion of VWF and alters the kinetics of the exocytic actin ring. These data offer a novel insight into the control of an essential physiological process and provide a new way in which it can be regulated.
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Affiliation(s)
- Sammy El-Mansi
- Centre for Microvascular Research, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Tom P Mitchell
- Centre for Microvascular Research, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
| | - Golzar Mobayen
- Department of Immunology and Inflammation, Centre for Haematology, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Thomas A J McKinnon
- Department of Immunology and Inflammation, Centre for Haematology, Imperial College London, Hammersmith Hospital Campus, London, United Kingdom
| | - Pika Miklavc
- School of Science, Engineering & Environment, University of Salford, Manchester, United Kingdom
| | - Manfred Frick
- Institute of General Physiology, Ulm University, Ulm, Germany
| | - Thomas D Nightingale
- Centre for Microvascular Research, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
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2
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Rusu L, Minshall RD. Myo1c drives actin-dependent VWF expulsion from EC WPBs. Blood Adv 2024; 8:4711-4713. [PMID: 39254967 DOI: 10.1182/bloodadvances.2024013476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/11/2024] Open
Affiliation(s)
- Luiza Rusu
- Departments of Anesthesiology, and Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL
| | - Richard D Minshall
- Departments of Anesthesiology, and Pharmacology and Regenerative Medicine, University of Illinois at Chicago, Chicago, IL
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3
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Biton T, Scher N, Carmon S, Elbaz-Alon Y, Schejter ED, Shilo BZ, Avinoam O. Fusion pore dynamics of large secretory vesicles define a distinct mechanism of exocytosis. J Cell Biol 2023; 222:e202302112. [PMID: 37707500 PMCID: PMC10501449 DOI: 10.1083/jcb.202302112] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 07/06/2023] [Accepted: 08/24/2023] [Indexed: 09/15/2023] Open
Abstract
Exocrine cells utilize large secretory vesicles (LSVs) up to 10 μm in diameter. LSVs fuse with the apical surface, often recruiting actomyosin to extrude their content through dynamic fusion pores. The molecular mechanism regulating pore dynamics remains largely uncharacterized. We observe that the fusion pores of LSVs in the Drosophila larval salivary glands expand, stabilize, and constrict. Arp2/3 is essential for pore expansion and stabilization, while myosin II is essential for pore constriction. We identify several Bin-Amphiphysin-Rvs (BAR) homology domain proteins that regulate fusion pore expansion and stabilization. We show that the I-BAR protein Missing-in-Metastasis (MIM) localizes to the fusion site and is essential for pore expansion and stabilization. The MIM I-BAR domain is essential but not sufficient for localization and function. We conclude that MIM acts in concert with actin, myosin II, and additional BAR-domain proteins to control fusion pore dynamics, mediating a distinct mode of exocytosis, which facilitates actomyosin-dependent content release that maintains apical membrane homeostasis during secretion.
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Affiliation(s)
- Tom Biton
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Nadav Scher
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Shari Carmon
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Yael Elbaz-Alon
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
| | - Eyal D. Schejter
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Ben-Zion Shilo
- Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel
| | - Ori Avinoam
- Department of Biomolecular Sciences, Weizmann Institute of Science, Rehovot, Israel
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4
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Duan Q, Zhang Q, Nie K, Huang R, Yang J, He P, Tie Z, Huang H, Ma G, Zhang Y, Gao Y, Wang L. Myo1d promotes alpha-synuclein transfer from brain microvascular endothelial cells to pericytes through tunneling nanotubes. iScience 2023; 26:107458. [PMID: 37575183 PMCID: PMC10416064 DOI: 10.1016/j.isci.2023.107458] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/27/2023] [Accepted: 07/19/2023] [Indexed: 08/15/2023] Open
Abstract
α-Synuclein preformed fibrils (α-syn PFF) in the blood can cross the blood-brain barrier and invade the central nervous system. Our previous study proved that α-syn PFF can be taken up by brain microvascular endothelial cells (BMVECs). Here, we found that α-syn PFF spread from BMVECs to pericytes with the highest transmission efficiency. We observed abundant tunneling nanotubes (TNTs) connecting BMVECs and pericytes, and α-syn PFF transmitted through these TNTs. Furthermore, α-syn PFF accumulation in BMVECs did not promote TNT formation, but activated the molecular motor Myo1d. Inhibition of Myo1d prevented α-syn PFF transfer from BMVECs to pericytes and decreased the colocalization of Myo1d and F-actin in BMVECs. In summary, we are the first to demonstrate that α-syn PFF spread from BMVECs to pericytes through a mechanism involving TNTs and myosin. Targeting Myo1d may be a promising approach to prevent α-syn spreading from the blood to the brain.
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Affiliation(s)
- Qingrui Duan
- School of Medicine, South China University of Technology, Guangzhou 510006, China
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Qingxi Zhang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Kun Nie
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Rui Huang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Jianhua Yang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Peikun He
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Zihui Tie
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Haifeng Huang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Guixian Ma
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Yuhu Zhang
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Yuyuan Gao
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
| | - Lijuan Wang
- School of Medicine, South China University of Technology, Guangzhou 510006, China
- Department of Neurology, Guangdong Neuroscience Institute, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
- Guangzhou Key Laboratory of Diagnosis and Treatment for Neurodegenerative Diseases, Guangdong Provincial People’s Hospital (Guangdong Academy of Medical Sciences), Southern Medical University, Guangzhou 510080, China
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5
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Diaz-Valencia JD, Estrada-Abreo LA, Rodríguez-Cruz L, Salgado-Aguayo AR, Patiño-López G. Class I Myosins, molecular motors involved in cell migration and cancer. Cell Adh Migr 2022; 16:1-12. [PMID: 34974807 PMCID: PMC8741282 DOI: 10.1080/19336918.2021.2020705] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 12/02/2021] [Accepted: 12/16/2021] [Indexed: 01/13/2023] Open
Abstract
Class I Myosins are a subfamily of motor proteins with ATPase activity and a characteristic structure conserved in all myosins: A N-Terminal Motor Domain, a central Neck and a C terminal Tail domain. Humans have eight genes for these myosins. Class I Myosins have different functions: regulate membrane tension, participate in endocytosis, exocytosis, intracellular trafficking and cell migration. Cell migration is influenced by many cellular components including motor proteins, like myosins. Recently has been reported that changes in myosin expression have an impact on the migration of cancer cells, the formation of infiltrates and metastasis. We propose that class I myosins might be potential markers for future diagnostic, prognostic or even as therapeutic targets in leukemia and other cancers.Abbreviations: Myo1g: Myosin 1g; ALL: Acute Lymphoblastic Leukemia, TH1: Tail Homology 1; TH2: Tail Homology 2; TH3: Tail Homology 3.
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Affiliation(s)
- Juan D. Diaz-Valencia
- Immunology and Proteomics Laboratory, Children’s Hospital of Mexico, Mexico City, Mexico
| | - Laura A. Estrada-Abreo
- Immunology and Proteomics Laboratory, Children’s Hospital of Mexico, Mexico City, Mexico
- Cell Biology and Flow Cytometry Laboratory, Metropolitan Autonomous University, México City, Mexico
| | - Leonor Rodríguez-Cruz
- Cell Biology and Flow Cytometry Laboratory, Metropolitan Autonomous University, México City, Mexico
| | - Alfonso R. Salgado-Aguayo
- Rheumatic Diseases Laboratory, National Institute of Respiratory Diseases “Ismael Cosío Villegas”, Mexico City, Mexico
| | - Genaro Patiño-López
- Immunology and Proteomics Laboratory, Children’s Hospital of Mexico, Mexico City, Mexico
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6
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Pernier J, Schauer K. Does the Actin Network Architecture Leverage Myosin-I Functions? BIOLOGY 2022; 11:biology11070989. [PMID: 36101369 PMCID: PMC9311500 DOI: 10.3390/biology11070989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 06/24/2022] [Accepted: 06/26/2022] [Indexed: 11/16/2022]
Abstract
The actin cytoskeleton plays crucial roles in cell morphogenesis and functions. The main partners of cortical actin are molecular motors of the myosin superfamily. Although our understanding of myosin functions is heavily based on myosin-II and its ability to dimerize, the largest and most ancient class is represented by myosin-I. Class 1 myosins are monomeric, actin-based motors that regulate a wide spectrum of functions, and whose dysregulation mediates multiple human diseases. We highlight the current challenges in identifying the “pantograph” for myosin-I motors: we need to reveal how conformational changes of myosin-I motors lead to diverse cellular as well as multicellular phenotypes. We review several mechanisms for scaling, and focus on the (re-) emerging function of class 1 myosins to remodel the actin network architecture, a higher-order dynamic scaffold that has potential to leverage molecular myosin-I functions. Undoubtfully, understanding the molecular functions of myosin-I motors will reveal unexpected stories about its big partner, the dynamic actin cytoskeleton.
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Affiliation(s)
- Julien Pernier
- Institute for Integrative Biology of the Cell (I2BC), Centre National de la Recherche Scientifique (CNRS), Commissariat à L’Énergie Atomique et aux Énergies Alternatives (CEA), Université Paris-Saclay, 91198 Gif-sur-Yvette, France;
| | - Kristine Schauer
- Tumor Cell Dynamics Unit, Inserm U1279, Gustave Roussy Institute, Université Paris-Saclay, 94800 Villejuif, France
- Correspondence:
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7
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Selçuk E, Kırımtay K, Temizci B, Akarsu Ş, Everest E, Baslo MB, Demirkıran M, Yapıcı Z, Karabay A. MYO1H is a novel candidate gene for autosomal dominant pure hereditary spastic paraplegia. Mol Genet Genomics 2022; 297:1141-1150. [PMID: 35704118 DOI: 10.1007/s00438-022-01910-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 05/23/2022] [Indexed: 11/25/2022]
Abstract
In this study, we aimed to determine the genetic basis of a Turkish family related to hereditary spastic paraplegia (HSP) by exome sequencing. HSP is a progressive neurodegenerative disorder and displays genetic and clinical heterogeneity. The major symptoms are muscle weakness and spasticity, especially in the lower extremities. We studied seven affected and seven unaffected family members, as well as a clinically undetermined member, to identify the disease-causing gene. Exome sequencing was performed for four affected and two unaffected individuals. The variants were firstly filtered for HSP-associated genes, and we found a common variant in the ZFYVE27 gene, which has been previously implied for association with HSP. Due to the incompletely penetrant segregation pattern of the ZFYVE27 variant, revealed by Sanger sequencing, with the disease in this family, filtering was re-performed according to the mode of inheritance and allelic frequencies. The resulting 14 rare variants were further evaluated in terms of their cellular functions, and three candidate variants in ATAD3C, VPS16, and MYO1H genes were selected as possible causative variants, which were analyzed for their familial segregation. ATAD3C and VPS16 variants were eliminated due to incomplete penetrance. Eventually, the MYO1H variant NM_001101421.3:c.2972_2974del (p.Glu992del, rs372231088) was found as the possible disease-causing deletion for HSP in this family. This is the first study reporting the possible role of a MYO1H variant in HSP pathogenesis. Further studies on the cellular roles of Myo1h protein are needed to validate the causality of MYO1H gene at the onset of HSP.
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Affiliation(s)
- Ece Selçuk
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey
- Department of Molecular Biology and Genetics, Istanbul Medeniyet University, Istanbul, 34700, Turkey
| | - Koray Kırımtay
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey
| | - Benan Temizci
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, 34469, Turkey
| | - Şeyma Akarsu
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, 34469, Turkey
| | - Elif Everest
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, 34469, Turkey
| | - Mehmet Barış Baslo
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, 34093, Istanbul, Turkey
| | - Meltem Demirkıran
- Department of Neurology, Faculty of Medicine, Çukurova University, 01330, Adana, Turkey
| | - Zuhal Yapıcı
- Department of Neurology, Istanbul Faculty of Medicine, Istanbul University, 34093, Istanbul, Turkey
| | - Arzu Karabay
- Molecular Biology, Genetics-Biotechnology, Graduate School of Science, Engineering and Technology, Istanbul Technical University, 34469, Istanbul, Turkey.
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, 34469, Turkey.
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8
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Richter S, Martin R, Gutzeit HO, Knölker HJ. In vitro and in vivo effects of inhibitors on actin and myosin. Bioorg Med Chem 2021; 30:115928. [PMID: 33341499 DOI: 10.1016/j.bmc.2020.115928] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 11/30/2020] [Accepted: 12/03/2020] [Indexed: 11/18/2022]
Abstract
The interaction of actin and myosin is essential for cell migration. We have identified kaempferol and pentahalogenated pseudilins as efficient inhibitors of migration of MDA-MB-231 breast adenocarcinoma cells. The compounds were studied with respect to possible effects on myosin-2-ATPase activity. The pentahalogenated pseudilins inhibited the enzyme activity in vitro. Flavonoids showed no effect on enzyme activity. The polymerization dynamics of actin was measured to test whether the integrity of F-actin is essential for the migration of MDA-MB-231 cells. Quercetin and kaempferol depolymerized F-actin with similar efficiencies as found for the pentahalogenated pseudilins, whereas epigallocatechin showed the weakest effect. As the inhibitory effect on cell migration may be caused by a toxic effect, we have performed a cytotoxicity test and, furthermore, investigated the influence of the test compounds on cardiac function in eleutheroembryos of medaka (Oryzias latipes). Compared with the pentahalogenated pseudilins, the cytotoxic and cardiotoxic effects of flavonoids on medaka embryos were found to be moderate.
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Affiliation(s)
- Sabine Richter
- Faculty of Biology, TU Dresden, Zellescher Weg 20b, 01217 Dresden, Germany
| | - René Martin
- Faculty of Chemistry, TU Dresden, Bergstrasse 66, 01069 Dresden, Germany
| | - Herwig O Gutzeit
- Faculty of Biology, TU Dresden, Zellescher Weg 20b, 01217 Dresden, Germany.
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9
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Miklavc P, Frick M. Actin and Myosin in Non-Neuronal Exocytosis. Cells 2020; 9:cells9061455. [PMID: 32545391 PMCID: PMC7348895 DOI: 10.3390/cells9061455] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 06/03/2020] [Accepted: 06/06/2020] [Indexed: 12/18/2022] Open
Abstract
Cellular secretion depends on exocytosis of secretory vesicles and discharge of vesicle contents. Actin and myosin are essential for pre-fusion and post-fusion stages of exocytosis. Secretory vesicles depend on actin for transport to and attachment at the cell cortex during the pre-fusion phase. Actin coats on fused vesicles contribute to stabilization of large vesicles, active vesicle contraction and/or retrieval of excess membrane during the post-fusion phase. Myosin molecular motors complement the role of actin. Myosin V is required for vesicle trafficking and attachment to cortical actin. Myosin I and II members engage in local remodeling of cortical actin to allow vesicles to get access to the plasma membrane for membrane fusion. Myosins stabilize open fusion pores and contribute to anchoring and contraction of actin coats to facilitate vesicle content release. Actin and myosin function in secretion is regulated by a plethora of interacting regulatory lipids and proteins. Some of these processes have been first described in non-neuronal cells and reflect adaptations to exocytosis of large secretory vesicles and/or secretion of bulky vesicle cargoes. Here we collate the current knowledge and highlight the role of actomyosin during distinct phases of exocytosis in an attempt to identify unifying molecular mechanisms in non-neuronal secretory cells.
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Affiliation(s)
- Pika Miklavc
- School of Science, Engineering & Environment, University of Salford, Manchester M5 4WT, UK
- Correspondence: (P.M.); (M.F.); Tel.: +44-0161-295-3395 (P.M.); +49-731-500-23115 (M.F.); Fax: +49-731-500-23242 (M.F.)
| | - Manfred Frick
- Institute of General Physiology, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- Correspondence: (P.M.); (M.F.); Tel.: +44-0161-295-3395 (P.M.); +49-731-500-23115 (M.F.); Fax: +49-731-500-23242 (M.F.)
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10
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Brzeska H, Gonzalez J, Korn ED, Titus MA. Basic-hydrophobic sites are localized in conserved positions inside and outside of PH domains and affect localization of Dictyostelium myosin 1s. Mol Biol Cell 2020; 31:101-117. [PMID: 31774725 PMCID: PMC6960411 DOI: 10.1091/mbc.e19-08-0475] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/14/2019] [Accepted: 11/22/2019] [Indexed: 11/21/2022] Open
Abstract
Myosin 1s have critical roles in linking membranes to the actin cytoskeleton via direct binding to acidic lipids. Lipid binding may occur through PIP3/PIP2-specific PH domains or nonspecific ionic interactions involving basic-hydrophobic (BH) sites but the mechanism of myosin 1s distinctive lipid targeting is poorly understood. Now we show that PH domains occur in all Dictyostelium myosin 1s and that the BH sites of Myo1A, B, C, D, and F are in conserved positions near the β3/β4 loops of their PH domains. In spite of these shared lipid-binding sites, we observe significant differences in myosin 1s highly dynamic localizations. All myosin 1s except Myo1A are present in macropinocytic structures but only Myo1B and Myo1C are enriched at the edges of macropinocytic cups and associate with the actin in actin waves. In contrast, Myo1D, E, and F are enclosed by the actin wave. Mutations of BH sites affect localization of all Dictyostelium myosin 1s. Notably, mutation of the BH site located within the PH domains of PIP3-specific Myo1D and Myo1F completely eradicates membrane binding. Thus, BH sites are important determinants of motor targeting and may have a similar role in the localization of other myosin 1s.
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Affiliation(s)
- Hanna Brzeska
- Laboratory of Cell Biology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892
| | - Jesus Gonzalez
- Laboratory of Cell Biology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892
| | - Edward D. Korn
- Laboratory of Cell Biology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892
| | - Margaret A. Titus
- Department of Genetics, Cell Biology and Development, University of Minnesota, Minneapolis, MN 55455
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11
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Zhang Y, Jiang X, Deng Q, Gao Z, Tang X, Fu R, Hu J, Li Y, Li L, Gao N. Downregulation of MYO1C mediated by cepharanthine inhibits autophagosome-lysosome fusion through blockade of the F-actin network. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2019; 38:457. [PMID: 31699152 PMCID: PMC6836678 DOI: 10.1186/s13046-019-1449-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2019] [Accepted: 10/15/2019] [Indexed: 01/10/2023]
Abstract
Background MYO1C, an actin-based motor protein, is involved in the late stages of autophagosome maturation and fusion with the lysosome. The molecular mechanism by which MYO1C regulates autophagosome-lysosome fusion remains largely unclear. Methods Western blotting was used to determine the expression of autophagy-related proteins. Transmission electron microscopy (TEM) was used to observe the ultrastructural changes. An immunoprecipitation assay was utilized to detect protein-protein interactions. Immunofluorescence analysis was used to detect autophagosome-lysosome fusion and colocalization of autophagy-related molecules. An overexpression plasmid or siRNA against MYO1C were sequentially introduced into human breast cancer MDA-MB-231 cells. Results We show here that cepharanthine (CEP), a novel autophagy inhibitor, inhibited autophagy/mitophagy through blockage of autophagosome-lysosome fusion in human breast cancer cells. Mechanistically, we found for the first time that MYO1C was downregulated by CEP treatment. Furthermore, the interaction/colocalization of MYO1C and F-actin with either LC3 or LAMP1 was inhibited by CEP treatment. Knockdown of MYO1C further decreased the interaction/colocalization of MYO1C and F-actin with either LC3 or LAMP1 inhibited by CEP treatment, leading to blockade of autophagosome-lysosome fusion. In contrast, overexpression of MYO1C significantly restored the interaction/colocalization of MYO1C and F-actin with either LC3 or LAMP1 inhibited by CEP treatment. Conclusion These findings highlight a key role of MYO1C in the regulation of autophagosome-lysosome fusion through F-actin remodeling. Our findings also suggest that CEP could potentially be further developed as a novel autophagy/mitophagy inhibitor, and a combination of CEP with classic chemotherapeutic drugs could become a promising treatment for breast cancer.
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Affiliation(s)
- Yanhao Zhang
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Xiuxing Jiang
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Qin Deng
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Ziyi Gao
- Greater Philadelphia Pharmacy, Philadelphia, USA
| | - Xiangyu Tang
- Biomedical Analysis Center, Army Medical University, Chongqing, 400038, China
| | - Ruoqiu Fu
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Jinjiao Hu
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Yunong Li
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Lirong Li
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China
| | - Ning Gao
- College of Pharmacy, Army Medical University, 30 Gaotanyan Street, Shapingba District, Chongqing, 400038, China. .,Key Laboratory of Basic Pharmacology of Ministry of Education and Joint International Research Laboratory of Ethnomedicine of Ministry of Education, Zunyi Medical University, Zunyi, China.
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12
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Müller MT, Schempp R, Lutz A, Felder T, Felder E, Miklavc P. Interaction of microtubules and actin during the post-fusion phase of exocytosis. Sci Rep 2019; 9:11973. [PMID: 31427591 PMCID: PMC6700138 DOI: 10.1038/s41598-019-47741-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Accepted: 07/09/2019] [Indexed: 01/24/2023] Open
Abstract
Exocytosis is the intracellular trafficking step where a secretory vesicle fuses with the plasma membrane to release vesicle content. Actin and microtubules both play a role in exocytosis; however, their interplay is not understood. Here we study the interaction of actin and microtubules during exocytosis in lung alveolar type II (ATII) cells that secrete surfactant from large secretory vesicles. Surfactant extrusion is facilitated by an actin coat that forms on the vesicle shortly after fusion pore opening. Actin coat compression allows hydrophobic surfactant to be released from the vesicle. We show that microtubules are localized close to actin coats and stay close to the coats during their compression. Inhibition of microtubule polymerization by colchicine and nocodazole affected the kinetics of actin coat formation and the extent of actin polymerisation on fused vesicles. In addition, microtubule and actin cross-linking protein IQGAP1 localized to fused secretory vesicles and IQGAP1 silencing influenced actin polymerisation after vesicle fusion. This study demonstrates that microtubules can influence actin coat formation and actin polymerization on secretory vesicles during exocytosis.
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Affiliation(s)
- M Tabitha Müller
- Institute of General Physiology, Ulm University, Albert-Einstein Allee 11, 89081, Ulm, Germany
| | - Rebekka Schempp
- Institute of General Physiology, Ulm University, Albert-Einstein Allee 11, 89081, Ulm, Germany
| | - Anngrit Lutz
- Institute of General Physiology, Ulm University, Albert-Einstein Allee 11, 89081, Ulm, Germany
| | - Tatiana Felder
- Institute of General Physiology, Ulm University, Albert-Einstein Allee 11, 89081, Ulm, Germany
| | - Edward Felder
- Institute of General Physiology, Ulm University, Albert-Einstein Allee 11, 89081, Ulm, Germany
| | - Pika Miklavc
- School of Environment and Life Sciences, University of Salford, The Crescent, M54WT, Salford, United Kingdom.
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13
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Cota Teixeira S, Silva Lopes D, Santos da Silva M, Cordero da Luz FA, Cirilo Gimenes SN, Borges BC, Alves da Silva A, Alves Martins F, Alves Dos Santos M, Teixeira TL, Oliveira RA, de Melo Rodrigues Ávila V, Barbosa Silva MJ, Elias MC, Martin R, Vieira da Silva C, Knölker HJ. Pentachloropseudilin Impairs Angiogenesis by Disrupting the Actin Cytoskeleton, Integrin Trafficking and the Cell Cycle. Chembiochem 2019; 20:2390-2401. [PMID: 31026110 DOI: 10.1002/cbic.201900203] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Indexed: 12/21/2022]
Abstract
Class 1 myosins (Myo1s) were the first unconventional myosins identified and humans have eight known Myo1 isoforms. The Myo1 family is involved in the regulation of gene expression, cytoskeletal rearrangements, delivery of proteins to the cell surface, cell migration and spreading. Thus, the important role of Myo1s in different biological processes is evident. In this study, we have investigated the effects of pentachloropseudilin (PClP), a reversible and allosteric potent inhibitor of Myo1s, on angiogenesis. We demonstrated that treatment of cells with PClP promoted a decrease in the number of vessels. The observed inhibition of angiogenesis is likely to be related to the inhibition of cell proliferation, migration and adhesion, as well as to alteration of the actin cytoskeleton pattern, as shown on a PClP-treated HUVEC cell line. Moreover, we also demonstrated that PClP treatment partially prevented the delivery of integrins to the plasma membrane. Finally, we showed that PClP caused DNA strand breaks, which are probably repaired during the cell cycle arrest in the G1 phase. Taken together, our results suggest that Myo1s participate directly in the angiogenesis process.
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Affiliation(s)
- Samuel Cota Teixeira
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Daiana Silva Lopes
- Multidisciplinary Institute of Health, Anísio Teixeira Campus, Federal University of Bahia, Rua Hormindo Barros, 58, Candeias, Vitória da Conquista, 45029-094, BA, Brazil
| | - Marcelo Santos da Silva
- Special Laboratory of Cell Cycle (LECC), Center of Toxins, Immune Response and Cell Signaling (CeTICS), Butantan Institute, Av. Vital Brasil, 1500 - Butantã, São Paulo, 05503-900, SP, Brazil.,The Wellcome Centre for Molecular Parasitology, Institute of Infection, Immunity and Inflammation, Sir Graeme Davies Building, University of Glasgow, 120 University Place, Glasgow, G12 8TA, UK
| | - Felipe Andrés Cordero da Luz
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Sarah Natalie Cirilo Gimenes
- Imunopathology Laboratory, Butantan Institute, Av. Vital Brasil, 1500 - Butantã, São Paulo, 05503-900, SP, Brazil
| | - Bruna Cristina Borges
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Aline Alves da Silva
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Flávia Alves Martins
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Marlus Alves Dos Santos
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Thaise Lara Teixeira
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Ricardo A Oliveira
- Medical School, Federal University of Uberlândia, Av. Pará, Bloco 2u, 1720 - Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Veridiana de Melo Rodrigues Ávila
- Institute of Biotechnology, Federal University of Uberlândia, Av. Pará, 1720 - Bloco 2E - Sala(s) 246 - Campus Umuarama, Uberlândia, 38405-320, MG, Brazil
| | - Marcelo José Barbosa Silva
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Maria Carolina Elias
- Special Laboratory of Cell Cycle (LECC), Center of Toxins, Immune Response and Cell Signaling (CeTICS), Butantan Institute, Av. Vital Brasil, 1500 - Butantã, São Paulo, 05503-900, SP, Brazil
| | - René Martin
- Fakultät Chemie, Technische Universität Dresden, Bergstraße 66, 01069, Dresden, Germany
| | - Claudio Vieira da Silva
- Department of Immunology, Biomedical Sciences Institute, Federal University of Uberlândia, Rua Piauí, Bloco 2B, sala 200, Campus Umuarama, Uberlândia, 38400-902, MG, Brazil
| | - Hans-Joachim Knölker
- Fakultät Chemie, Technische Universität Dresden, Bergstraße 66, 01069, Dresden, Germany
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14
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An Interaction Network of the Human SEPT9 Established by Quantitative Mass Spectrometry. G3-GENES GENOMES GENETICS 2019; 9:1869-1880. [PMID: 30975701 PMCID: PMC6553528 DOI: 10.1534/g3.119.400197] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Septins regulate the organization of the actin cytoskeleton, vesicle transport and fusion, chromosome alignment and segregation, and cytokinesis in mammalian cells. SEPT9 is part of the core septin hetero-octamer in human cells which is composed of SEPT2, SEPT6, SEPT7, and SEPT9. SEPT9 has been linked to a variety of intracellular functions as well as to diseases and diverse types of cancer. A targeted high-throughput approach to systematically identify the interaction partners of SEPT9 has not yet been performed. We applied a quantitative proteomics approach to establish an interactome of SEPT9 in human fibroblast cells. Among the newly identified interaction partners were members of the myosin family and LIM domain containing proteins. Fluorescence microscopy of SEPT9 and its interaction partners provides additional evidence that SEPT9 might participate in vesicle transport from and to the plasma membrane as well as in the attachment of actin stress fibers to cellular adhesions.
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15
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Capmany A, Yoshimura A, Kerdous R, Caorsi V, Lescure A, Nery ED, Coudrier E, Goud B, Schauer K. MYO1C stabilizes actin and facilitates arrival of transport carriers at the Golgi apparatus. J Cell Sci 2019; 132:jcs.225029. [DOI: 10.1242/jcs.225029] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 03/01/2019] [Indexed: 12/22/2022] Open
Abstract
We aim to identify the myosin motor proteins that control trafficking at the Golgi apparatus. In addition to the known Golgi-associated myosins MYO6, MYO18A and MYH9 (myosin IIA), we identify MYO1C as a novel player at the Golgi. We demonstrate that depletion of MYO1C induces Golgi apparatus fragmentation and decompaction. MYO1C accumulates at dynamic structures around the Golgi apparatus that colocalize with Golgi-associated actin dots. MYO1C depletion leads to loss of cellular F-actin, and Golgi apparatus decompaction is also observed after the inhibition or loss of the Arp2/3 complex. We show that the functional consequences of MYO1C depletion is a delay in the arrival of incoming transport carriers, both from the anterograde and retrograde routes. We propose that MYO1C stabilizes actin at the Golgi apparatus facilitating the arrival of incoming transport carriers at the Golgi.
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Affiliation(s)
- Anahi Capmany
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
| | - Azumi Yoshimura
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
| | - Rachid Kerdous
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
| | | | - Aurianne Lescure
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Department of Translational Research, BioPhenics High-Content Screening Laboratory, Cell and Tissue Imaging Facility (PICT-IBiSA), Paris, France
| | - Elaine Del Nery
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Department of Translational Research, BioPhenics High-Content Screening Laboratory, Cell and Tissue Imaging Facility (PICT-IBiSA), Paris, France
| | - Evelyne Coudrier
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
| | - Bruno Goud
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
| | - Kristine Schauer
- Institut Curie, PSL Research University, Molecular Mechanisms of Intracellular Transport group, 75248 Paris Cedex 05, France
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche144, 75005 Paris, France
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16
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Kannan N, Tang VW. Myosin-1c promotes E-cadherin tension and force-dependent recruitment of α-actinin to the epithelial cell junction. J Cell Sci 2018; 131:jcs.211334. [PMID: 29748378 DOI: 10.1242/jcs.211334] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 05/02/2018] [Indexed: 12/26/2022] Open
Abstract
Actomyosin II contractility in epithelial cell plays an essential role in tension-dependent adhesion strengthening. One key unsettling question is how cellular contraction transmits force to the nascent cell-cell adhesion when there is no stable attachment between the nascent adhesion complex and actin filament. Here, we show that myosin-1c is localized to the lateral membrane of polarized epithelial cells and facilitates the coupling between actin and cell-cell adhesion. Knockdown of myosin-1c compromised the integrity of the lateral membrane, reduced the generation of tension at E-cadherin, decreased the strength of cell-cell cohesion in an epithelial cell monolayer and prevented force-dependent recruitment of junctional α-actinin. Application of exogenous force to cell-cell adhesions in a myosin-1c-knockdown cell monolayer fully rescued the localization defect of α-actinin, indicating that junction mechanoregulation remains intact in myosin-1c-depleted cells. Our study identifies a role of myosin-1c in force transmission at the lateral cell-cell interface and underscores a non-junctional contribution to tension-dependent junction regulation.
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Affiliation(s)
- Nivetha Kannan
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, IL 61801 USA
| | - Vivian W Tang
- Department of Cell and Developmental Biology, University of Illinois, Urbana-Champaign, IL 61801 USA
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17
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Chung CL, Wang SW, Martin R, Knölker HJ, Kao YC, Lin MH, Chen JJ, Huang YB, Wu DC, Chen CL. Pentachloropseudilin Inhibits Transforming Growth Factor-β (TGF-β) Activity by Accelerating Cell-Surface Type II TGF-β Receptor Turnover in Target Cells. Chembiochem 2018; 19:851-864. [DOI: 10.1002/cbic.201700693] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Indexed: 12/22/2022]
Affiliation(s)
- Chih-Ling Chung
- Department of Biological Sciences; National Sun Yat-sen University; Kaohsiung 80424 ROC Taiwan
| | - Shih-Wei Wang
- Department of Biological Sciences; National Sun Yat-sen University; Kaohsiung 80424 ROC Taiwan
| | - René Martin
- Department of Chemistry; Technische Universität Dresden; Bergstrasse 66 01069 Dresden Germany
| | - Hans-Joachim Knölker
- Department of Chemistry; Technische Universität Dresden; Bergstrasse 66 01069 Dresden Germany
| | - Yu-Chen Kao
- Department of Biological Sciences; National Sun Yat-sen University; Kaohsiung 80424 ROC Taiwan
| | - Ming-Hong Lin
- Department of Microbiology and Immunology; Faculty of Medicine; Kaohsiung Medical University Hospital; Kaohsiung 80708 ROC Taiwan
| | - Jih-Jung Chen
- Faculty of Pharmacy; School of Pharmaceutical Sciences; National Yang-Ming University; Taipei 11221 ROC Taiwan
| | - Yaw-Bin Huang
- Department of Biological Sciences; National Sun Yat-sen University; Kaohsiung 80424 ROC Taiwan
- Department of Pharmacy; School of Pharmacy; Kaohsiung Medical University; Kaohsiung 80708 ROC Taiwan
- Center for Stem Cell Research; Kaohsiung Medical University; Kaohsiung 80708 ROC Taiwan
| | - Deng-Chyang Wu
- Division of Gastroenterology; Department of Internal Medicine; Kaohsiung Medical University Hospital; Kaohsiung 80708 ROC Taiwan
- Center for Stem Cell Research; Kaohsiung Medical University; Kaohsiung 80708 ROC Taiwan
| | - Chun-Lin Chen
- Department of Biological Sciences; National Sun Yat-sen University; Kaohsiung 80424 ROC Taiwan
- Doctoral Degree Program in Marine Biotechnology; National Sun Yat-sen University and Academia Sinica; Kaohsiung 80424 ROC Taiwan
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18
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Gupta P, Martin R, Knölker HJ, Nihalani D, Kumar Sinha D. Myosin-1 inhibition by PClP affects membrane shape, cortical actin distribution and lipid droplet dynamics in early Zebrafish embryos. PLoS One 2017; 12:e0180301. [PMID: 28678859 PMCID: PMC5498032 DOI: 10.1371/journal.pone.0180301] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Accepted: 06/13/2017] [Indexed: 12/22/2022] Open
Abstract
Myosin-1 (Myo1) represents a mechanical link between the membrane and actin-cytoskeleton in animal cells. We have studied the effect of Myo1 inhibitor PClP in 1-8 cell Zebrafish embryos. Our results indicate a unique involvement of Myo1 in early development of Zebrafish embryos. Inhibition of Myo1 (by PClP) and Myo2 (by Blebbistatin) lead to arrest in cell division. While Myo1 isoforms appears to be important for both the formation and the maintenance of cleavage furrows, Myo2 is required only for the formation of furrows. We found that the blastodisc of the embryo, which contains a thick actin cortex (~13 μm), is loaded with cortical Myo1. Myo1 appears to be crucial for maintaining the blastodisc morphology and the actin cortex thickness. In addition to cell division and furrow formation, inhibition of Myo1 has a drastic effect on the dynamics and distribution of lipid droplets (LDs) in the blastodisc near the cleavage furrow. All these results above are effects of Myo1 inhibition exclusively; Myo2 inhibition by blebbistatin does not show such phenotypes. Therefore, our results demonstrate a potential role for Myo1 in the maintenance and formation of furrow, blastodisc morphology, cell-division and LD organization within the blastodisc during early embryogenesis.
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MESH Headings
- Actin Cytoskeleton/drug effects
- Actin Cytoskeleton/metabolism
- Actins/genetics
- Actins/metabolism
- Animals
- Blastomeres/cytology
- Blastomeres/metabolism
- Blastomeres/ultrastructure
- Blotting, Western
- Cell Division/drug effects
- Cell Division/genetics
- Cell Membrane/metabolism
- Embryo, Nonmammalian/embryology
- Embryo, Nonmammalian/metabolism
- Embryo, Nonmammalian/ultrastructure
- Gene Expression Regulation, Developmental
- Heterocyclic Compounds, 4 or More Rings/pharmacology
- Hydrocarbons, Chlorinated/pharmacology
- Lipid Droplets/metabolism
- Microscopy, Electron, Scanning
- Microscopy, Fluorescence
- Myosin Heavy Chains/antagonists & inhibitors
- Myosin Heavy Chains/genetics
- Myosin Heavy Chains/metabolism
- Pyrroles/pharmacology
- Reverse Transcriptase Polymerase Chain Reaction
- Zebrafish/embryology
- Zebrafish/genetics
- Zebrafish/metabolism
- Zebrafish Proteins/antagonists & inhibitors
- Zebrafish Proteins/genetics
- Zebrafish Proteins/metabolism
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Affiliation(s)
| | - René Martin
- Department Chemie, TU Dresden, Dresden, Germany
| | | | - Deepak Nihalani
- Dept. Medicine, Medical University of South Carolina, Charleston, South Carolina, United States of America
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19
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Olmeda B, Martínez-Calle M, Pérez-Gil J. Pulmonary surfactant metabolism in the alveolar airspace: Biogenesis, extracellular conversions, recycling. Ann Anat 2016; 209:78-92. [PMID: 27773772 DOI: 10.1016/j.aanat.2016.09.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 09/22/2016] [Accepted: 09/25/2016] [Indexed: 01/03/2023]
Abstract
Pulmonary surfactant is a lipid-protein complex that lines and stabilizes the respiratory interface in the alveoli, allowing for gas exchange during the breathing cycle. At the same time, surfactant constitutes the first line of lung defense against pathogens. This review presents an updated view on the processes involved in biogenesis and intracellular processing of newly synthesized and recycled surfactant components, as well as on the extracellular surfactant transformations before and after the formation of the surface active film at the air-water interface. Special attention is paid to the crucial regulation of surfactant homeostasis, because its disruption is associated with several lung pathologies.
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Affiliation(s)
- Bárbara Olmeda
- Department of Biochemistry, Faculty of Biology, and Research Institute "Hospital 12 de Octubre", Complutense University, 28040 Madrid, Spain
| | - Marta Martínez-Calle
- Department of Biochemistry, Faculty of Biology, and Research Institute "Hospital 12 de Octubre", Complutense University, 28040 Madrid, Spain
| | - Jesus Pérez-Gil
- Department of Biochemistry, Faculty of Biology, and Research Institute "Hospital 12 de Octubre", Complutense University, 28040 Madrid, Spain.
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20
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The SHIP2 interactor Myo1c is required for cell migration in 1321 N1 glioblastoma cells. Biochem Biophys Res Commun 2016; 476:508-514. [DOI: 10.1016/j.bbrc.2016.05.154] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 05/28/2016] [Indexed: 12/29/2022]
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21
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Abstract
Myosin-I molecular motors are proposed to play various cellular roles related to membrane dynamics and trafficking. In this Cell Science at a Glance article and the accompanying poster, we review and illustrate the proposed cellular functions of metazoan myosin-I molecular motors by examining the structural, biochemical, mechanical and cell biological evidence for their proposed molecular roles. We highlight evidence for the roles of myosin-I isoforms in regulating membrane tension and actin architecture, powering plasma membrane and organelle deformation, participating in membrane trafficking, and functioning as a tension-sensitive dock or tether. Collectively, myosin-I motors have been implicated in increasingly complex cellular phenomena, yet how a single isoform accomplishes multiple types of molecular functions is still an active area of investigation. To fully understand the underlying physiology, it is now essential to piece together different approaches of biological investigation. This article will appeal to investigators who study immunology, metabolic diseases, endosomal trafficking, cell motility, cancer and kidney disease, and to those who are interested in how cellular membranes are coupled to the underlying actin cytoskeleton in a variety of different applications.
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Affiliation(s)
- Betsy B McIntosh
- Pennsylvania Muscle Institute and Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6085, USA
| | - E Michael Ostap
- Pennsylvania Muscle Institute and Department of Physiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6085, USA
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